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丸趣 TV 小编给大家分享一下 Sqlserver 镜像切换操作并检查镜像同步情况的示例分析,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
主节点上:
ALTER DATABASE [dbname] SET SAFETY FULL
ALTER DATABASE [dbname] SET PARTNER FAILOVER
切换完毕到从节点,新的主节点上:
ALTER DATABASE [dbname] SET SAFETY OFF
检查镜像同步情况:
SET NOCOUNT ON
DECLARE @db_name varchar(100)
DECLARE @dblist TABLE([db_name] varchar(100))
DECLARE @a TABLE(
database_name SYSNAME
,[role] INT
,mirroring_state INT
,witness_status INT
,log_generation_rate INT
,unsent_log INT
,send_rate INT
,unrestored_log INT
,recovery_rate INT
,transaction_delay INT
,transactions_per_sec INT
,average_delay INT
,time_recorded DATETIME
,time_behind DATETIME
,local_time DATETIME
)
– 导出镜像数据库名列表
insert into @dblist
select a.name
from sys.sysdatabases a (nolock)
join sys.database_mirroring b (nolock) on a.dbid=b.database_id
where mirroring_guid is not null
EXEC msdb.dbo.sp_dbmmonitorupdate
EXEC msdb.dbo.sp_dbmmonitorupdate – 若 server 是初次执行这个 sp,可能不会产生数据,所以需要再执行一次
– 每个镜像数据库的相关记录通过循环全部导入表变量
while exists(select * from @dblist)
begin
set @db_name=(select top 1 [db_name] from @dblist)
delete @dblist where [db_name]=@db_name
INSERT INTO @a
EXEC msdb.dbo.sp_dbmmonitorresults @db_name
,0 – 返回行数:- 1 行;- 前条;- 最近两小时行数;
,0 –0 表示不调用 sp_dbmmonitorupdate,表示调用
end
SELECT database_name
,CASE [role] WHEN 1 THEN 主体数据库
WHEN 2 THEN 镜像数据库
ELSE NULL END AS db_role
,CASE mirroring_state WHEN 0 THEN 已挂起
WHEN 1 THEN 已断开
WHEN 2 THEN 正在同步
WHEN 3 THEN 挂起故障转移
WHEN 4 THEN 已同步
ELSE NULL END AS mirroring_state
,CASE witness_status WHEN 0 THEN 未知
WHEN 1 THEN 已连接
WHEN 2 THEN 已断开
ELSE NULL END AS witness_status
,unsent_log AS unsent_log[kb]
,unrestored_log AS unrestored_log[kb]
,send_rate AS send_rate[kb/s]
,recovery_rate AS recovery_rate[kb/s]
,transaction_delay AS transaction_delay/ms
,transactions_per_sec
,average_delay
,time_recorded
,time_behind
,local_time
FROM @a
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